“Spammers are using Facebook Events to trick users into completing online surveys, taking part in online contests and perform other tasks which allow spammers to generate commissions.
According to multiple security firms, spammers using Facebook Events to promote their links have been highly successful in their efforts to dupe unsuspecting users thus far. According to a report from TrendMicro,”tens of thousands” of users had mistakenly registered for one spammer’s event. Meanwhile, Sophos found an example where over 10 million Facebook users had been targeted, and over 165,000 had accepted.”
From The New York Times